Anybody dreaming of Mars colonies should keep that in mind. As long as the Mars colony will be dependent on supplies from Earth, they will do what Earth wants.

Anybody dreaming of Mars colonies should keep that in mind. As long as the Mars colony will be dependent on supplies from Earth, they will do what Earth wants. Once they are self sufficient, this will change. C.f. the immigration-friendly early U.S. and its "close borders" and PR lottery approaches of today.